// -----------------------------------------------------------------------------------
//
//	Lightbox v2.02-SEB
//	by Lokesh Dhakar - http://www.huddletogether.com
//	3/31/06
//
// 	Feature FeatBrowser added by SÃ©bastien Grosjean - ZenCocoon.com
// 	11/22/06
//
//	For more information on this script, visit:
//	http://huddletogether.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//	
//	Credit also due to those who have helped, inspired, and made their code available to the public.
//	Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.org), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------
/*

Table of Contents
-----------------
Configuration
Global Variables

Extending Built-in Objects	
- Object.extend(Element)
- Array.prototype.removeDuplicates()
- Array.prototype.empty()

Lightbox Class Declaration
- initialize()
- start()
- changeImage()
SEB
- adjustImageSize()
END SEB
- resizeImageContainer()
- showImage()
- updateDetails()
- updateNav()
- enableKeyboardNav()
- disableKeyboardNav()
- keyboardAction()
- preloadNeighborImages()
- end()
	
Miscellaneous Functions
- getPageScroll()
- getPageSize()
- getKey()
- listenKey()
- showSelectBoxes()
- hideSelectBoxes()
- pause()
SEB
- updateImageSize
END SEB
- initLightbox()
	
Function Calls
- addLoadEvent(initLightbox)
	
*/
// -----------------------------------------------------------------------------------

//
//	Configuration
//
var fileLoadingImage = chrome.extension.getURL("js/lightbox2/images/loading.gif");
var fileBottomNavCloseImage = chrome.extension.getURL("js/lightbox2/images/closelabel.gif");

var resizeSpeed = 9; // controls the speed of the image resizing (1=slowest and 10=fastest)
var borderSize = 10; // if you adjust the padding in the CSS, you will need to update this variable

// SEB
var featBrowser = false; // set it to true or false to choose to auto-adjust the maximum size to the browser
var breathingSize = 10; // control the minimum space around the image box
// END SEB
// -----------------------------------------------------------------------------------

//
//	Global Variables
//
var imageArray = new Array;
var activeImage;

if (resizeSpeed > 10) { resizeSpeed = 10; }
if (resizeSpeed < 1) { resizeSpeed = 1; }
resizeDuration = (11 - resizeSpeed) * 0.15;

// -----------------------------------------------------------------------------------

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
    getWidth: function (element) {
        element = $(element);
        return element.offsetWidth;
    },
    setWidth: function (element, w) {
        element = $(element);
        element.style.width = w + "px";
    },
    setHeight: function (element, h) {
        element = $(element);
        element.style.height = h + "px";
    },
    setTop: function (element, t) {
        element = $(element);
        element.style.top = t + "px";
    },
    setSrc: function (element, src) {
        element = $(element);
        element.src = src;
    },
    setHref: function (element, href) {
        element = $(element);
        element.href = href;
    },
    setInnerHTML: function (element, content) {
        element = $(element);
        element.innerHTML = content;
    }
});

// -----------------------------------------------------------------------------------

//
//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
Array.prototype.removeDuplicates = function () {
    for (i = 1; i < this.length; i++) {
        if (this[i][0] == this[i - 1][0]) {
            this.splice(i, 1);
        }
    }
}

// -----------------------------------------------------------------------------------

Array.prototype.empty = function () {
    for (i = 0; i <= this.length; i++) {
        this.shift();
    }
}

// -----------------------------------------------------------------------------------

//
//	Lightbox Class Declaration
//	- initialize()
//	- start()
//	- changeImage()
//	- adjustImageSize()
//	- resizeImageContainer()
//	- showImage()
//	- updateDetails()
//	- updateNav()
//	- enableKeyboardNav()
//	- disableKeyboardNav()
//	- keyboardNavAction()
//	- preloadNeighborImages()
//	- end()
//
//	Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {

    // initialize()
    // Constructor runs on completion of the DOM loading. Loops through anchor tags looking for 
    // 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
    // the function inserts html at the bottom of the page which is used to display the shadow 
    // overlay and the image container.
    //
    initialize: function () {
        if (!document.getElementsByTagName) { return; }
        var anchors = document.getElementsByTagName('a');

		var lboxLinks = 0;	

        // loop through all anchor tags
        for (var i = 0; i < anchors.length; i++) {
            var anchor = anchors[i];

            var relAttribute = String(anchor.getAttribute('rel'));
			
            // use the string.match() method to catch 'lightbox' references in the rel attribute
            if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))) {
                anchor.onclick = function () { myLightbox.start(this); return false; }
				lboxLinks++;
            }
        }

		//alert(lboxLinks + " Lightbox items!");

        // The rest of this code inserts html at the bottom of the page that looks similar to this:
        //
        //	<div id="overlay"></div>
        //	<div id="lightbox">
        //		<div id="outerImageContainer">
        //			<div id="imageContainer">
        //				<img id="lightboxImage">
        //				<div style="" id="hoverNav">
        //					<a href="#" id="prevLink"></a>
        //					<a href="#" id="nextLink"></a>
        //				</div>
        //				<div id="loading">
        //					<a href="#" id="loadingLink">
        //						<img src="/images/loading.gif">
        //					</a>
        //				</div>
        //			</div>
        //		</div>
        //		<div id="imageDataContainer">
        //			<div id="imageData">
        //				<div id="imageDetails">
        //					<span id="caption"></span>
        //					<span id="numberDisplay"></span>
        //				</div>
        //				<div id="bottomNav">
        //					<a href="#" id="bottomNavClose">
        //						<img src="/images/close.gif">
        //					</a>
        //				</div>
        //			</div>
        //		</div>
        //	</div>


        var objBody = document.getElementsByTagName("body").item(0);

        var objOverlay = document.createElement("div");
        objOverlay.setAttribute('id', 'overlay');
        objOverlay.style.display = 'none';
        objOverlay.onclick = function () { myLightbox.end(); return false; }
        objBody.appendChild(objOverlay);

        var objLightbox = document.createElement("div");
        objLightbox.setAttribute('id', 'lightbox');
        objLightbox.style.display = 'none';
        objBody.appendChild(objLightbox);

        var objOuterImageContainer = document.createElement("div");
        objOuterImageContainer.setAttribute('id', 'outerImageContainer');
        objLightbox.appendChild(objOuterImageContainer);

        var objImageContainer = document.createElement("div");
        objImageContainer.setAttribute('id', 'imageContainer');
        objOuterImageContainer.appendChild(objImageContainer);

        var objLightboxImage = document.createElement("img");
        objLightboxImage.setAttribute('id', 'lightboxImage');
        objImageContainer.appendChild(objLightboxImage);

        var objHoverNav = document.createElement("div");
        objHoverNav.setAttribute('id', 'hoverNav');
        objImageContainer.appendChild(objHoverNav);

        var objPrevLink = document.createElement("a");
        objPrevLink.setAttribute('id', 'prevLink');
        objPrevLink.setAttribute('href', '#');
        objHoverNav.appendChild(objPrevLink);

		objPrevLink.style.background = "url(" + chrome.extension.getURL("js/lightbox2/images/prevlabel.gif") + ") left 15% no-repeat";

        var objNextLink = document.createElement("a");
        objNextLink.setAttribute('id', 'nextLink');
        objNextLink.setAttribute('href', '#');
        objHoverNav.appendChild(objNextLink);

		objNextLink.style.background = "url(" + chrome.extension.getURL("js/lightbox2/images/nextlabel.gif") + ") right 15% no-repeat";

        var objLoading = document.createElement("div");
        objLoading.setAttribute('id', 'loading');
        objImageContainer.appendChild(objLoading);

        var objLoadingLink = document.createElement("a");
        objLoadingLink.setAttribute('id', 'loadingLink');
        objLoadingLink.setAttribute('href', '#');
        objLoadingLink.onclick = function () { myLightbox.end(); return false; }
        objLoading.appendChild(objLoadingLink);

        var objLoadingImage = document.createElement("img");
        objLoadingImage.setAttribute('src', fileLoadingImage);
        objLoadingLink.appendChild(objLoadingImage);

        var objImageDataContainer = document.createElement("div");
        objImageDataContainer.setAttribute('id', 'imageDataContainer');
        objImageDataContainer.className = 'clearfix';
        objLightbox.appendChild(objImageDataContainer);

        var objImageData = document.createElement("div");
        objImageData.setAttribute('id', 'imageData');
        objImageDataContainer.appendChild(objImageData);

        var objImageDetails = document.createElement("div");
        objImageDetails.setAttribute('id', 'imageDetails');
        objImageData.appendChild(objImageDetails);

        var objCaption = document.createElement("span");
        objCaption.setAttribute('id', 'caption');
        objImageDetails.appendChild(objCaption);

        var objNumberDisplay = document.createElement("span");
        objNumberDisplay.setAttribute('id', 'numberDisplay');
        objImageDetails.appendChild(objNumberDisplay);

        var objBottomNav = document.createElement("div");
        objBottomNav.setAttribute('id', 'bottomNav');
        objImageData.appendChild(objBottomNav);

        var objBottomNavCloseLink = document.createElement("a");
        objBottomNavCloseLink.setAttribute('id', 'bottomNavClose');
        objBottomNavCloseLink.setAttribute('href', '#');
        objBottomNavCloseLink.onclick = function () { myLightbox.end(); return false; }
        objBottomNav.appendChild(objBottomNavCloseLink);

        var objBottomNavCloseImage = document.createElement("img");
        objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
        objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
    },

    //
    //	start()
    //	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
    //
    start: function (imageLink) {

        hideSelectBoxes();

        // stretch overlay to fill page and fade in
        var arrayPageSize = getPageSize();
        Element.setHeight('overlay', arrayPageSize[1]);
        new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });

        imageArray = [];
        imageNum = 0;

        if (!document.getElementsByTagName) { return; }
        var anchors = document.getElementsByTagName('a');

        // if image is NOT part of a set..
        if ((imageLink.getAttribute('rel') == 'lightbox')) {
            // add single image to imageArray
            imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));
        } else {
            // if image is part of a set..

            // loop through anchors, find other images in set, and add them to imageArray
            for (var i = 0; i < anchors.length; i++) {
                var anchor = anchors[i];
                if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))) {
                    imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
                }
            }
            imageArray.removeDuplicates();
            while (imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++; }
        }

        // calculate top offset for the lightbox and display 
        var arrayPageSize = getPageSize();
        var arrayPageScroll = getPageScroll();
        var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 15);

        Element.setTop('lightbox', lightboxTop);
        Element.show('lightbox');

        // SEB
        if (featBrowser == true) { Event.observe(window, 'resize', updateImageSize, false); }
        // END SEB
        this.changeImage(imageNum);
    },

    //
    //	changeImage()
    //	Hide most elements and preload image in preparation for resizing image container.
    //
    changeImage: function (imageNum) {

        activeImage = imageNum; // update global var

        // hide elements during transition
        Element.show('loading');
        Element.hide('lightboxImage');
        Element.hide('hoverNav');
        Element.hide('prevLink');
        Element.hide('nextLink');
        Element.hide('imageDataContainer');
        Element.hide('numberDisplay');

        imgPreloader = new Image();

        // once image is preloaded, resize image container
        imgPreloader.onload = function () {
            Element.setSrc('lightboxImage', imageArray[activeImage][0]);
            // SEB
            imageArray[activeImage][2] = imgPreloader.width;
            imageArray[activeImage][3] = imgPreloader.height;
            myLightbox.adjustImageSize(false);
            // ORIG: myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
            // END SEB
        }
        imgPreloader.src = imageArray[activeImage][0];
    },

    // SEB
    //
    //  adjustImageSize()
    //  adjust image size if option featBrowser is set to true
    //
    adjustImageSize: function (recall) {
        // get image size
        imgWidth = imageArray[activeImage][2];
        imgHeight = imageArray[activeImage][3];

        // adjust image size if featBrowser option is set to true
        if (featBrowser == true) {
            var arrayPageSize = getPageSize();
            // calculate proportions 
            var imageProportion = imgWidth / imgHeight;
            var winProportion = arrayPageSize[2] / arrayPageSize[3];

            if (imageProportion > winProportion) {
                // calculate max width base on page width
                var maxWidth = arrayPageSize[2] - (borderSize * 4) - (breathingSize * 2);
                var maxHeight = Math.round(maxWidth / imageProportion);
            } else {
                // calculate maw height base on page height
                var maxHeight = arrayPageSize[3] - (borderSize * 5) - (arrayPageSize[3] / 15) - breathingSize;
                var maxWidth = Math.round(maxHeight * imageProportion);
            }
            if (imgWidth > maxWidth || imgHeight > maxHeight) {
                imgWidth = maxWidth;
                imgHeight = maxHeight;
            }
        }
        Element.setWidth('lightboxImage', imgWidth);
        Element.setHeight('lightboxImage', imgHeight);

        if (recall == true) {
            Element.setWidth('outerImageContainer', imgWidth + (borderSize * 2));
            Element.setHeight('outerImageContainer', imgHeight + (borderSize * 2));
            Element.setWidth('imageDataContainer', imgWidth + (borderSize * 2));
        } else {
            myLightbox.resizeImageContainer(imgWidth, imgHeight);
        }
    },
    // END SEB

    //
    //	resizeImageContainer()
    //
    resizeImageContainer: function (imgWidth, imgHeight) {
        // get current height and width
        this.wCur = Element.getWidth('outerImageContainer');
        this.hCur = Element.getHeight('outerImageContainer');

        // scalars based on change from old to new
        this.xScale = ((imgWidth + (borderSize * 2)) / this.wCur) * 100;
        this.yScale = ((imgHeight + (borderSize * 2)) / this.hCur) * 100;

        // calculate size difference between new and old image, and resize if necessary
        wDiff = (this.wCur - borderSize * 2) - imgWidth;
        hDiff = (this.hCur - borderSize * 2) - imgHeight;

        if (!(hDiff == 0)) { new Effect.Scale('outerImageContainer', this.yScale, { scaleX: false, duration: resizeDuration, queue: 'front' }); }
        if (!(wDiff == 0)) { new Effect.Scale('outerImageContainer', this.xScale, { scaleY: false, delay: resizeDuration, duration: resizeDuration }); }

        // if new and old image are same size and no scaling transition is necessary, 
        // do a quick pause to prevent image flicker.
        if ((hDiff == 0) && (wDiff == 0)) {
            if (navigator.appVersion.indexOf("MSIE") != -1) { pause(250); } else { pause(100); }
        }

        Element.setHeight('prevLink', imgHeight);
        Element.setHeight('nextLink', imgHeight);
        Element.setWidth('imageDataContainer', imgWidth + (borderSize * 2));

        this.showImage();
    },

    //
    //	showImage()
    //	Display image and begin preloading neighbors.
    //
    showImage: function () {
        Element.hide('loading');
        new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function () { myLightbox.updateDetails(); } });
        this.preloadNeighborImages();
    },

    //
    //	updateDetails()
    //	Display caption, image number, and bottom nav.
    //
    updateDetails: function () {

        Element.show('caption');
        Element.setInnerHTML('caption', imageArray[activeImage][1]);

        // if image is part of set display 'Image x of x' 
        if (imageArray.length > 1) {
            Element.show('numberDisplay');
            Element.setInnerHTML('numberDisplay', "Image " + eval(activeImage + 1) + " of " + imageArray.length);
        }

        new Effect.Parallel(
			[new Effect.SlideDown('imageDataContainer', { sync: true, duration: resizeDuration + 0.1, from: 0.0, to: 1.0 }),
			  new Effect.Appear('imageDataContainer', { sync: true, duration: 1.0 })],
			{ duration: 0.2, afterFinish: function () { myLightbox.updateNav(); } }
		);
    },

    //
    //	updateNav()
    //	Display appropriate previous and next hover navigation.
    //
    updateNav: function () {

        Element.show('hoverNav');

        // if not first image in set, display prev image button
        if (activeImage != 0) {
            Element.show('prevLink');
            document.getElementById('prevLink').onclick = function () {
                myLightbox.changeImage(activeImage - 1); return false;
            }
        }

        // if not last image in set, display next image button
        if (activeImage != (imageArray.length - 1)) {
            Element.show('nextLink');
            document.getElementById('nextLink').onclick = function () {
                myLightbox.changeImage(activeImage + 1); return false;
            }
        }

        this.enableKeyboardNav();
    },

    //
    //	enableKeyboardNav()
    //
    enableKeyboardNav: function () {
        document.onkeydown = this.keyboardAction;
    },

    //
    //	disableKeyboardNav()
    //
    disableKeyboardNav: function () {
        document.onkeydown = '';
    },

    //
    //	keyboardAction()
    //
    keyboardAction: function (e) {
        if (e == null) { // ie
            keycode = event.keyCode;
        } else { // mozilla
            keycode = e.which;
        }

        key = String.fromCharCode(keycode).toLowerCase();

        if ((key == 'x') || (key == 'o') || (key == 'c')) {	// close lightbox
            myLightbox.end();
        } else if (key == 'p') {	// display previous image
            if (activeImage != 0) {
                myLightbox.disableKeyboardNav();
                myLightbox.changeImage(activeImage - 1);
            }
        } else if (key == 'n') {	// display next image
            if (activeImage != (imageArray.length - 1)) {
                myLightbox.disableKeyboardNav();
                myLightbox.changeImage(activeImage + 1);
            }
        }


    },

    //
    //	preloadNeighborImages()
    //	Preload previous and next images.
    //
    preloadNeighborImages: function () {

        if ((imageArray.length - 1) > activeImage) {
            preloadNextImage = new Image();
            preloadNextImage.src = imageArray[activeImage + 1][0];
        }
        if (activeImage > 0) {
            preloadPrevImage = new Image();
            preloadPrevImage.src = imageArray[activeImage - 1][0];
        }

    },

    //
    //	end()
    //
    end: function () {
        this.disableKeyboardNav();
        Element.hide('lightbox');
        new Effect.Fade('overlay', { duration: 0.2 });
        showSelectBoxes();
    }
}

// -----------------------------------------------------------------------------------

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll() {

    var yScroll;

    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) {// all other Explorers
        yScroll = document.body.scrollTop;
    }

    arrayPageScroll = new Array('', yScroll)
    return arrayPageScroll;
}

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize() {

    var xScroll, yScroll;

    if (window.innerHeight && window.scrollMaxY) {
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY;
    } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight;
    } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight;
    }

    var windowWidth, windowHeight;
    if (self.innerHeight) {	// all except Explorer
        windowWidth = self.innerWidth;
        windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight;
    } else if (document.body) { // other Explorers
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight;
    }

    // for small pages with total height less then height of the viewport
    if (yScroll < windowHeight) {
        pageHeight = windowHeight;
    } else {
        pageHeight = yScroll;
    }

    // for small pages with total width less then width of the viewport
    if (xScroll < windowWidth) {
        pageWidth = windowWidth;
    } else {
        pageWidth = xScroll;
    }


    arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
    return arrayPageSize;
}

// -----------------------------------------------------------------------------------

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e) {
    if (e == null) { // ie
        keycode = event.keyCode;
    } else { // mozilla
        keycode = e.which;
    }
    key = String.fromCharCode(keycode).toLowerCase();

    if (key == 'x') {
    }
}

// -----------------------------------------------------------------------------------

//
// listenKey()
//
function listenKey() { document.onkeypress = getKey; }

// ---------------------------------------------------

function showSelectBoxes() {
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
        selects[i].style.visibility = "visible";
    }
}

// ---------------------------------------------------

function hideSelectBoxes() {
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
        selects[i].style.visibility = "hidden";
    }
}

// ---------------------------------------------------

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
    var now = new Date();
    var exitTime = now.getTime() + numberMillis;
    while (true) {
        now = new Date();
        if (now.getTime() > exitTime)
            return;
    }
}

// ---------------------------------------------------

// SEB
function updateImageSize() { myLightbox.adjustImageSize(true); }
// END SEB
function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);